Sensorless Control of a Three-Section Permanent Magnet Valve Electric Motor

A method of sensorless control of a three-section valve electric motor with 120-degree commuting windings is proposed. The commuting of the windings is carried out when the back-EMF of the section to be disconnected and connected is equal; the third section is connected to a constant voltage source. In this case, the electromagnetic torque of the motor varies slightly. The commuting times are determined using a function depending on the ratio of back-EMF of the section to be disconnected and connected. This function does not depend on the rotational frequency and can be used in a wide range of speeds. The angle of rotation of the rotor and the rotational frequency for controlling the motor are determined after converting the equations of the motor to a two-phase system. An example of starting the motor with the transition to a sensorless control system commuting windings is given. The effectiveness and efficiency of the method are confirmed by modeling a low-power three-section valve electric motor in the MATLAB&Simulink system using the SimPowersystems extension

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